package com.rj.bd.utils;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * @author FTY
 * @dasc 验证码工具类
 * @time 2021-05-14 9:18
 */
public class CodeUtils {
    public static void main(String[] args) {


        for (int i = 0; i <10; i++) {
            CodeUtils.createCode();
        }



    }

    public static String createCode()
    {
        String[] beforeShuffle = new String[] { "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
        List<String> list = Arrays.asList(beforeShuffle);
        Collections.shuffle(list);//自动洗牌
        StringBuilder sb =new StringBuilder();
        for (int i = 0; i < list.size(); i++)
        {
            sb.append(list.get(i));
        }
        String afterShuffle = sb.toString();
        String result = afterShuffle.substring(5, 9);
        System.out .println(result) ;
        return result;
    }
}
